Biology
How are carbon dioxide and urea, excreted by the foetus, removed?
Reproductive System
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Answer
The placenta is formed of two sets of finger-like projections, the villi. One set is given out by uterine wall and the other set by allantois from the embryo. These two set of villi are interlocked. The impurities excreted by foetus are exchanged by their capillaries to the capillaries of uterine wall (mother).
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